羧甲基半纤维素的制备及其与湿强剂PAE的联用

Preparation of Carboxymethyl Hemicellulose and Its Application with Polyamide Epichlorohydrin Resin as Wet Strength Additive

关键词:  羧甲基半纤维素（CMX）  聚酰胺多胺-表氯醇树脂（PAE）  醚化  湿抗张指数

Key Words:carboxymethyl hemicellulose  polyamide epichlorohydrin resin  etherification  wet strength

摘要:采用醚化法制备了具有较高羧基含量、较高分子质量的羧甲基半纤维素（CMX），并将其与聚酰胺多胺-表氯醇树脂类湿强剂（PAE）联用以提高纸张的湿抗张强度。通过对CMX制备过程中碱用量、碱化反应时间、碱化反应温度、反应体系、醚化剂氯乙酸（SMCA）用量、醚化反应温度、醚化反应时间等条件的分析，探究CMX较优制备工艺，并分析其与PAE联用的增强效果。结果表明，CMX最佳制备工艺条件为：碱化反应时间1 h，碱化反应温度25℃，商品半纤维素（AXU）与NaOH的摩尔比为1∶2；醚化反应时间5 h，醚化反应温度55℃，AXU与SMCA的摩尔比为1∶1。当CMX溶液（质量分数1.25%）的用量为4.8%，PAE湿强剂溶液（质量分数12.5%）用量为2.0%时，纸张湿抗张指数达到了9.63 N·m/g，相较于PAE单独使用时，湿抗张指数提高了25.8%。

Abstract:Carboxymethyl hemicellulose (CMX) with high carboxyl content and high molecular weight was prepared by etherification process,and applied with epichlorohydrin resin to improve the wet strength of paper. The preparation conditions were studied such as the alkaline dosage, the alkalization time, the alkalization temperature, the dosage of etherifying agent, the etherification temperature and the etherification time, the optimal preparation process was explored as follows: the alkalization was carried out for 1 h at room temperature after addition of aqueous NaOH, the molar ratio of hemicellulose and NaOH was 1∶2, the etherification was carried out for 5 h and the etherification temperature was 55℃, the molar ratio of hemicellulose and etherification agent was 1∶1. The wet strength index of the paper reached 9.63 N·m/g when CMX and PAE additions were 4.8% and 2.0% respectively , which was 25.8% higher than that of using PAE alone.